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Removal of silences. There are normally silences between words and sentences, and even small silences within certain words. These can be reduced considerably and still leave an understandable result.

Increasing speed. The speed can be increased on the entire audio track, but this has the undesirable effect of increasing the frequency, so the voice sounds high-pitched (like someone who has inhaled helium). This can be compensated for, however, by bringing the pitch back down to the proper frequency.

The same number of words can be compressed into a smaller time, and thus reduce advertising costs, or more information can be included in a given radio or TV ad. Another advantage is that this method seems to make the ad louder (by increasing the average volume), and thus more likely to be noticed, without exceeding the maximum volume allowed by law.

Voice compression/speech compression/voice encoding/speech encoding/audio compression (data) (these often refers to compression for transmission or storage, possibly to an unintelligible state, with decompression used during playback)

A proprietary implementation probably of the Synchronised OverLap Add method for speech compression that works on flash videos played in internet browsers. In this context the beta version is provided for free.